Internal-combustion-engine cylinder



Aug. 13; 1929. F N A 1,724,012

INTERNAL COMBUSTION ENGINE CYLINDER Filed Feb. 12, 1926 Patented Aug. 13, 1929.

UNITED STATES PATENT OFFICE.

GUIDO FORNACA, OF TURIN, ITALY.

INTERNAL-COMBUSTION-ENGINE CYLINQER.

Application filed February 12 1926, Serial No. 87,883, and in Italy February 27, 1925.

The object of this invention is to provide an improved cylinder for internal combustion engines of the multiple piston type with oppositely arranged cylinders.

To the attainment of this object an internal combustion engine cylinder in accordance with the present invention is made of steel machined from a steel block or rod, and is completed by welding to it the necessary fittings, such as cover pieces for the outlet and scavenging ports.

Preferably, the flanges for the attachment of the cylinder to the bed plate and the sockets for the reception of the spark plugs are formed integral with the cylinder, while the outlet and scavenging ports are completed by cover pieces as aforesaid which are secured, by autogenous welding or other means, to ribs projecting from the cylinder so as to form, in conjunction with said ribs, outlet branches for the ports.

The cylinder may include a cooling jacket comprising two stamped up pieces of sheet metal welded together and to the cylinder body, and provision may be made within each outlet branch for cooling those portions of the cylinder wall which divide up the port completed by said branch into separate orifices.

The accompanying drawing shows, by way of example, a constructional form of double cylinder suitable for a two stroke engine of the opposed cylinder type.

Figure 1 represents a vertical axial section of the cylinder.

Figure 2 represents a section through the cylinder on line 22 of Fig. 1.

Figure 3 represents a section through the cylinder on line 33 of Fig. 1.

Figure 4 represents a section through the cylinder on line 4-4: of Fig. 1 (that is, in the plane of the spark plugs).

Fig. 5 represents part of a longitudinal section of the cylinder on line 5-5 of Fig. 2.

Fig. 6 shows the cylinder complete with cooling jacket in longitudinal section.

Figure 7 represents a section through the cylinder on line 7-7-7-7 of Fig. 6.

Fig. 8 is a perspective partial view of the cylinder.

On the drawing, the reference 1 denotes the double cylinder, in which two opposed pistons are adapted to reciprocate. Two series of scavenging and outlet ports 2 and 3 are formed in the cylinder at the middle for the ports.

Flanges 5 for the attachment of the cylinder to the engine bed plate, and flanges 12 for the attachment of the water jacket, are formed integral with the cylinder.

The water jacket comprises two stamped up sheet metal pieces 11 (Figs. 6 and 7) welded together and to the cylinder at the flanges 12, at the spark plug sockets 4E, and at the outlet branches 2, 3 Pipe-connecting-flanges 8 are provided at the outlet branches 2 3 and the weld at each of these parts serves to connect the flange 8, the outlet branch and the water jacket.

Bosses 9 (Figs. 2 and 5) are formed be tween each pair of ribs 6, 6, adjacent those portions of the cylinder wall which divide up each port 2 or 3 within said ribs into sepa rate orifices, and a hole 9 is bored through each of said bosses for the passage of the cooling medium circulated in the jacket, these holes being formed by first drilling through the flanges 3 and 12 as shown in Figs. 3 and 8.

A cylinder made as herein described, whilst being relatively cheap, is exceptionally light and strong and has provision whereby it can be adequately cooled when in use.

Although I have described the invention in detail as applied to a cylinder for a multiple piston engine of the opposed cylinder type, it will be apparent that single cylinders for two or four stroke engines can be constructed in similar manner making certain changes which will be obvious to those skilled in the art.

What I claim is:

An engine cylinder comprising a tubular body having scavenging and outlet ports formed therein, symmetrical ribs at said ports, identically shaped plates welded to said ribs forming conduits from said ports,

bosses between said ribs forming partitions in said ports, and pipe connecting flanges at the ends of said conduits.

In testimony that I claim the foregoing as my invention I have signed my name.

GUIDO FORNAGA. 

